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dave2017

Selections, filters and adjustments

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Maybe I've got this wrong, but it seems to me that some filters, such as Unsharp Mask in Affinity Photo are not affected by spatial selections.

If I mark out a selected area on an image, then apply Unsharp Mask and move the Before/After display over the image, it's not only the area bounded by the selection which shows up as having changed. Is this a bug or a feature?

Clearly sometimes changes are restricted to selected areas - such as lightening, exposure etc., but it seems to be a matter of trial and error to find which ones are constrained by spatial selections.

Sometimes in an image there is one feature which cries out to be sharpened, or vice-versa to be blurred. If the selections don't work as expected this can be confusing.

For this post I'm restricting my concerns to spatial constraints, though I also have some queries (to follow maybe) regarding colour tonal range constraints.

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i can't do this right now as I don't have access to the machine on which I noticed the issues. That is/was an iMac 21.5 inch running El Capitan. My MBP Retina laptop i7 is now running High Sierra, but is currently awaiting a replacement battery. I may have access to other similar machines. I will try to show these issues when I get the MBP back from the repair shop..

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